358 



THE PLAGIOSTOMIA. 



over the pectorals and at the sides of the dorsal row. A group of small tubercles 

 above the end of the snout; larger tubercles, with swollen ribbed bases and long 

 sharp apices, in a median row on back and tail, in a group of three on each 

 shoulder and in a pair above each spiracle; a single tubercle in front of each eye. 

 Lower surfaces smooth. 



Chocolate-brown above and below; narrow white areas about the mouth, 

 and a white spot immediately behind the middle of the shoulder girdle. 



Total length lOj, snout to ends of pectorals 5, snout to ends of ventrals 6, 

 and greatest width 6| inches. 



Lat. T 05' 30" N.; Long. 79° 40" W. Albatross 1891 Expedition, at 

 1270 fathoms. _ 



Raia aguja. 



Rata aguja Kendall & Radcliffe, 1912, Mem. M. C Z., 35, p. 78, pi. 1, fig. 1, 2. 



Disk rhomboid, subquadrangular, little wider than long, anterior margins 

 nearly straight, meeting in an angle of 97°, outer and hinder angles rounded, 

 hinder margins very broadly curved. Snout long; rostral cartilage slender. 

 Length of orbit about equal width of interorbital space, nearly one third of the 

 distance from the end of the snout. Width of spiracle less than length of orbit. 

 Nostrils small, valve produced in a lateral angle. Mouth large, straight, width 

 equal that of internarial space, which is about half of the preoral length of the 

 snout. Teeth small, in H rows, each tooth with a flattened crown, transversely 

 elliptical in outline, from which a small sharp point extends toward the throat. 

 Ventrals deeply notched anterior portion narrow with several notches on the 

 hinder edge. Tail shorter than the body, depressed, moderately slender, with a 

 dermal fold along each side. Dorsals small, rounded on the margins, inserted on 

 the hindmost fourth of the tail, separated from one another by a space about 

 equal a basal length, and distant from the end of the tail nearly one length of a 

 dorsal fin. Scales small, sharp, hooked, loosely placed, larger and closer to- 

 gether at each side of the top of the tail, along the middle of the body and 

 above the forward portion of the disk and the head. A vertebral row of 26 small 

 compressed hooked tubercles on the tail from the body to the dorsal; no other 

 tubercles on head or body (young) . 



Total length \\\, snout to ends of pectorals 65, snout to abdominal pores 51, 

 snout to ends of ventrals 6|, snout to mouth l|, tail from axils of ventrals 5f, 

 and greatest width 7| inches. 



